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Common Stock and Stock-Based Compensation (Tables) | 12 Months Ended
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May. 31, 2015
Common Stock and Stock-based Compensation [Abstract] |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan | The following table summarizes the Company’s total stock-based compensation expense recognized in Operating overhead expense:
|  | Year Ended May 31,
(In millions) |  | 2015 |  | 2014 |  | 2013
Stock options(1) |  | $ | 136 |  |  | $ | 125 |  |  | $ | 123 |
ESPPs |  | 24 |  |  | 22 |  |  | 19 |
Restricted stock |  | 31 |  |  | 30 |  |  | 32 |
TOTAL STOCK-BASED COMPENSATION EXPENSE |  | $ | 191 |  |  | $ | 177 |  |  | $ | 174 |
(1) | Expense for stock options includes the expense associated with stock appreciation rights. Accelerated stock option expense is recorded for employees eligible for accelerated stock option vesting upon retirement. Accelerated stock option expense for the years ended May 31, 2015, 2014 and 2013 was $19 million, $15 million and $22 million, respectively.
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The weighted average assumptions used to estimate these fair values are as follows:
|  | Year Ended May 31,
|  | 2015 |  | 2014 |  | 2013
Dividend yield |  | 1.2 | % |  | 1.3 | % |  | 1.5 | %
Expected volatility |  | 23.6 | % |  | 27.9 | % |  | 35.0 | %
Weighted average expected life (in years) |  | 5.8 |  |  | 5.3 |  |  | 5.3 |
Risk-free interest rate |  | 1.7 | % |  | 1.3 | % |  | 0.6 | %
Schedule of Share-based Compensation, Stock Options, Activity | The following summarizes the stock option transactions under the plan discussed above:
|  | Shares(1) |  | Weighted Average Option Price
|  | (In millions) |  |
Options outstanding May 31, 2012 |  | 64.3 |  |  | $ | 30.59 |
Exercised |  | (9.9 | ) |  | 24.70 |
Forfeited |  | (1.3 | ) |  | 40.14 |
Granted |  | 14.6 |  |  | 46.55 |
Options outstanding May 31, 2013 |  | 67.7 |  |  | $ | 34.72 |
Exercised |  | (11.0 | ) |  | 28.29 |
Forfeited |  | (1.3 | ) |  | 48.33 |
Granted |  | 8.1 |  |  | 63.54 |
Options outstanding May 31, 2014 |  | 63.5 |  |  | $ | 39.28 |
Exercised |  | (13.6 | ) |  | 30.78 |
Forfeited |  | (1.0 | ) |  | 59.02 |
Granted |  | 9.2 |  |  | 77.68 |
Options outstanding May 31, 2015 |  | 58.1 |  |  | $ | 47.00 |
Options exercisable at May 31, |  |  |  |
2013 |  | 35.9 |  |  | $ | 27.70 |
2014 |  | 37.0 |  |  | 31.42 |
2015 |  | 34.3 |  |  | 36.53 |
(1) | Includes stock appreciation rights transactions.

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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